Release v0.3.0

Continuity Camera is finally here! Use your iPhone as a webcam.

What's Changed

• feat(gtk): remember last opened tab by @zackb in #291
• feat(ui): show phone battery, carrier, signal strength in UI by @zackb in #292
• fix(gtk): transparent border under header should be opaque by @zackb in #294
• feat: continuity camera by @zackb in #295

Full Changelog: v0.2.43...v0.3.0